Elliot Kim
Cellos, like other violin family instruments, have a sound post. This is a cylindrical piece of wood, usually spruce, that is wedged between the front and back plates inside the instrument. The sound post is fitted with tension so that it can stand on its own without glue. Its main function is to transmit the vibrations of the string from the top plate to the back plate, while also supporting the front and counteracting the stresses of string tension. The optimal fitting and placement of the sound post will improve the sound of the instrument.
| Characteristics | Values |
|---|---|
| Material | Spruce wood |
| Shape | Cylindrical |
| Function | Carries vibrations from the top plate to the bottom plate |
| Position | No 'one size fits all' approach; depends on the tension and position of the post, as well as the musician's needs |
| Installation | Should be installed by a professional luthier |
| Maintenance | Should be evaluated by a luthier if its condition is questionable |
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What You'll Learn
- The sound post is a cylindrical piece of wood that is wedged between the front and back plates of a cello
- Its function is to transmit vibrations from the top plate to the back plate
- The position and tension of the sound post affect the timbre and tone of the cello
- A luthier can adjust the sound post to the musician's preference
- A sound post can fall out of place and needs to be reset
The sound post is a cylindrical piece of wood that is wedged between the front and back plates of a cello
The sound post is an integral component of a cello, and its presence dramatically impacts the sound of the instrument. This small, cylindrical piece of wood, typically made from spruce, is strategically placed inside the cello, between the front and back plates. The sound post is not glued but fitted with tension, allowing it to stand securely on its own. Its positioning near the treble bridge foot is crucial, as it forces the cello into highly asymmetric modes of vibration, resulting in a powerful projection of sound.
The sound post plays a vital role in transmitting vibrations from the top plate to the bottom plate, supporting the front and counteracting the tension of the strings. Its presence stiffens the plates, enhancing their response to vibrations as the cello is played. The precise placement and tension of the sound post influence the response and timbre of the cello, contributing to the overall sound quality.
While there is no one-size-fits-all approach to sound post positioning, luthiers play a crucial role in interpreting the feedback from the instrument to determine the optimal tension and location of the post. They work closely with musicians to understand their personal tastes and playing requirements, making adjustments to ensure the sound post is tailored to the individual cellist and their instrument. This customisation ensures the cello produces the desired sound and meets the player's expectations.
The sound post's ability to enhance the cello's sound is so significant that Italian luthiers refer to it as the "anima" or "soul." Its impact on the instrument's acoustics and structure is profound, and its proper fitting and placement are essential for optimal sound quality. A well-fitted sound post can transform the cello's sound, addressing issues such as poor response, inadequate power, and imbalance between registers.
While some cello owners attempt to adjust or reset their sound posts themselves, especially if they live in remote areas, it is generally recommended to consult a skilled luthier. They possess the expertise to evaluate the condition of the sound post, make precise adjustments, and ensure the post is securely fitted, enhancing the instrument's sound and preventing potential damage. A sound post that is not properly fitted can cause various issues, and its adjustment is a delicate task that requires training and experience.
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Its function is to transmit vibrations from the top plate to the back plate
The sound post of a cello is a small cylindrical piece of wood, usually spruce, that is fitted between the front and back plates of the instrument. Its function is to transmit vibrations from the top plate to the back plate, while also providing structural support to the front of the cello and counteracting the tension of the strings. The positioning and tension of the sound post are crucial to the sound and response of the cello, and it is the job of a luthier to interpret the musician's feedback and adjust the sound post accordingly.
The sound post is introduced through the treble f-hole and positioned under the treble foot of the bridge. It is wedged in place with tension, rather than glue, so that it can vibrate freely and transmit sound effectively. The position of the sound post near the treble bridge foot forces the cello into highly asymmetric modes of vibration, which project sound very powerfully. If the sound post is removed, the bridge area vibrates with a more neutral, symmetrical 'see-saw' action, resulting in a much quieter sound as less air is forced through the sound holes.
The optimal fitting and placement of the sound post are essential to achieving the best sound from the instrument. A skilled luthier will use the sound post to tune the response of the cello, adjusting the tension and position to suit the individual musician's needs and preferences. The length of the sound post is also important, with longer posts typically producing darker, deeper tones, and shorter posts producing brighter, higher tones.
While there is no 'one-size-fits-all' approach to sound post positioning, there are some standard measurements that luthiers use as a starting point. For example, the top of the sound post should be positioned at half the thickness of the bridge foot. The sound post should also be placed symmetrically with the bass-bar, with a slight overlap. These measurements can be fine-tuned to accommodate the unique characteristics of each instrument and the preferences of the musician.
It is important to note that the sound post should not be permanently installed in a cello. While it may seem inconvenient that this small, loose piece of wood can easily fall out of place, its adjustability is crucial to the sound and playability of the instrument. A well-fitted sound post can make a dramatic difference in the sound of a cello, and it is normal for musicians to seek adjustments to improve their instrument's response and projection.
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The position and tension of the sound post affect the timbre and tone of the cello
The sound post of a cello is a crucial element in producing sound. When a sound post is fitted between the front and back of the cello, the plates become stiffer in their response to vibration as the instrument is played. Acousticians have discovered that the position of the sound post near the treble bridge foot forces the cello into asymmetric modes of vibration, which project sound powerfully. If the sound post is removed, the bridge area vibrates with a more neutral, symmetrical "see-saw" action, and the sound becomes quieter.
The exact position and tension of the sound post determine how effectively these breathing modes perform and, therefore, the position and tension of the sound post have a huge impact on the sound of a cello. The tension of the fitting refers to how firmly the sound post is lodged between the front and back of the cello. The luthier must interpret the feedback from the instrument to determine the cello's needs in terms of tension and position. There is no "one-size-fits-all" approach, and adjustments are made according to the musician's personal taste and playing demands.
The symptoms of an ill-fitted sound post include poor wolf notes, an imbalance between the different registers of the cello, and a slow or uneven response. A well-fitted sound post, with appropriate tension and position, will usually resolve these issues. The luthier must visualise the complex interplay between tension, position, and fit, and judge the effect of each parameter on the cello.
The tone of a cello is one of the most important elements of a cellist's sound, creating their musical identity. While there are many techniques to develop a refined cello tone, the position and tension of the sound post are fundamental to the cello's sound and must be optimised by a skilled luthier.
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A luthier can adjust the sound post to the musician's preference
The sound post of a cello is a small, cylindrical wooden dowel that is placed inside the instrument, connecting the top and back plates. It is fitted with tension and is wedged between the front and back of the cello, with its position affecting the sound and tone of the instrument. When a sound post is fitted, the plates become stiffer in their response to vibration as the instrument is played. Acousticians have discovered that the position of the sound post near the treble bridge foot forces the instrument into highly asymmetric modes of vibration, which project sound very powerfully.
It is important to note that there is no "one-size-fits-all" approach to sound post adjustment. The luthier must be skilled and experienced in making these adjustments, as a poorly fitted sound post can permanently damage the instrument. Musicians should ensure that the luthier they work with is specialized in sound post adjustment and has a good understanding of the instrument's needs and the musician's preferences.
While some musicians may attempt to adjust the sound post themselves, especially if they live far from any luthiers, it is generally recommended to seek professional help. Adjusting a sound post requires delicacy and sensitivity, and improper adjustments can lead to issues such as bad wolf notes, imbalance between registers, and inadequate power and projection. Therefore, it is crucial to have a trained luthier adjust the sound post to ensure the best outcome for the instrument and the musician's playing style.
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A sound post can fall out of place and needs to be reset
Cellos do have sound posts, and they are an integral part of the instrument. The sound post is a small piece of wood fitted between the front and back of the cello, and it is crucial for the sound of the instrument. When the cello is played, the sound post stiffens the plates' response to vibration, and its position near the treble bridge foot forces the instrument into asymmetric modes of vibration, which project sound powerfully.
While it may seem odd that such a flimsy piece of wood is left loose inside the cello, a well-fitted sound post should not fall out under normal circumstances. The sound post is moveable to allow for adjustments to the sound and projection of the instrument, and to accommodate the expansion and contraction of the wooden components due to temperature and humidity changes.
However, sound posts can fall out of place, and when this happens, the cello's top may collapse due to the loss of structural integrity. If the sound post has fallen, it is recommended to see a luthier to have it reset, as it requires a special S-shaped tool to replace it. Attempting to reset the sound post without the proper tools can be challenging, and there is a risk of damaging the cello.
To prevent the sound post from falling out of place, it is important to maintain the proper tension on the strings. Loosening the strings can cause the sound post to fall, so it is crucial to keep the cello flat when loosening or removing the strings. Regular adjustments by a skilled luthier can also help ensure that the sound post is properly fitted and adjusted, reducing the risk of it falling out of place.
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Frequently asked questions
Yes, cellos have a sound post. It is a small cylindrical piece of wood that is wedged between the front and back plates inside the instrument.
The sound post transmits vibrations from the top plate to the bottom plate. Its optimal fitting and placement are crucial to producing the best sound.
The sound post should be positioned under the a-string side foot of the bridge. You can use a business card cut lengthwise in half to check its position.
Take your cello to a luthier to get it reset. If that is not possible, you can try using a sharpened piece of coat hanger wire or a cheap soundpost setter.
